Saw-setting machine.



PATENTED APR. 10, 1906.

0. NAPIER. SAW SETTING MACHINE.

APPLIGATION FILED SEPT.3, 1904.

2 SHEBTS-SHEET 1.

PATENTED APR. 10, 1906.

C. NAPIER.

SAW SETTING MACHINE. APPLICATION FILED SEPT.3. 1904 2 SHEETS-SHEET 2.

inn 1 'rns CHARLES NAPIER, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO EDWARD S. BRADFORD, JR, OF SPRINGFIELD, MAS- SAOHUSETTS.

SAW-SETTING MACHINE.

Specification of Letters Patent.

Patented April 10, 1906.

To all whom it may concern:

Be it known that I, CHARLES NAPIER, a citizen of the United States of America, residing at Springfield, in the county of'I-Iampden and State of Massachusetts, have invented new and useful Improvements in Saw-Setting Machines, of which the following is a specification.

This invention relates to saw-setting machines, the object thereof being to provide a machine of this character through which saws may be fedcontinuously between suitable guides, the teeth of the saw passing between the ends of intermeshing toothed wheels, whereby the teeth are successively set out of line with the plane of the blade as desired.

The invention is fully illustrated in the accompanying drawings, in which Figure 1 is a plan view of the machine in which is embodied this invention in its preferred form. Fig. 2 is a sectional elevation of the same on line 2 2, Fig. 1. Fig. 3 is a side elevation of the machine viewed from the right-hand side of Figs. 1. and 2. Fig. 4 is an enlarged sectional plan view of a portion of the interineshing setting-wheels, showing the relation of the teeth thereof to the saw. Fig. 5 is a sectional elevation of that part of the setting-wheels shown in Fig. 4, said section being on line 5 5 of that figure. Fig. 6 is a perspective view of a saw-guide. Fig. 7 is a cross-section of the saw, whose teeth are set according to the invention. de scribed herein.

Referring to the drawings, the mechanism is supported on a suitable bed (1, provided with legs I). Beneath. the bed in a hanger c is a short driving-shaft (1, provided with the usual driving-pulley c. On the driving-shaft d is the worm j, which meshes with the wormgear g, fixed on a vertical shaft h, which is supported in a bearing on the bed of the machine. Secured on said shaft below the worm-gear g is the gear 76, which in turn meshes with a like gear m on a vertically-disposed shaft 0, supportedin parallelism with the shaft h and in a similar bearing. These shafts h and 0 extend above the bed (1, their upper ends being supported by a bracket 19, b0 ted to the bed and having bearings for the ends of the shafts. On these shafts between these bearings and the surface of the bedplate the intermeshing saw-setting disks are located, these being revoluble with the shafts, said disks being indicated, respectively, by r and s, and they are located 011 their respective shafts at some little distance above the surface of the bed, as shown in Figs. 2 and 3, whereby space is provided for a saw-guide t, which extends from one side of the bed to the other and is loosely secured on one side of the machine, as by a bolt (1, or other suitable means, which will permit the free end of the guide to move more or less in a vertical plane. The center line of the guide is located in the same vertical plane as the points of intersection of the teeth on the two setting-disks r and s, and it extends across the bed of the machine and beyond the edge of the latter in such position that its over hanging end may be engaged by a lever a pivotally supported on the machine and provided with a weight a whereby a saw in the guide '15 may have its teeth always yieldingly pressed into the inverted-\l-shaped space formed by the intersection of the oblique lower ends of the intermeshing teeth on the setting-disks, as will be described farther on.

The saw-guide t is shown in perspective on a somewhat-reduced scale in Fig. 6 and consists of a metal bar having downhanging ends through which screws pass which secure the guide to the bed-plate. On the upper side of the guide are two raised ribs t, having a 1011- gitudinallydisposed slot t between them, into the end of which saws may be introduced oneafter the other by the operator, the teeth of the saws being uppermost. Toward the forward end of the ribs t the upper edge thereof is milled off, as shown in Fig. 6, to expose the teeth of the saw, and at this point the teeth are engaged by a rotary feedingwheel a, the relation thereof to the saw being clearly shown in Fig. 2. The extreme forward edges of the ribs 25 are beveled off in. a vertical plane to permit them to be introduced between the setting-disks r and 8 close up to the point of their intersection, whereby the saw may be steadied and rigidly supported in a vertical plane. The feeding-wheel u is constructed with teeth on its periphery adapted to engage the teeth of the saw, and

this wheel is supported on a short shaft 0) in a bearing 'w on the bed. This wheel a is 1'0- tated by means of the beveled gears a", and y, the former being fixed on the shaft '0 and the latter on a vertically-disposed shaft 3, supported in a bearing on the bed-plate parallel with the shafts 0 and h and receiving movement from the shaft 0 through a gear 4 on its lower extremity which engages with the gear m on the shaft 0. The teeth 5 on the disks 1" and s are spaced to correspond to the spacing between the teeth of the saws on which they are to operate, and preferably these teeth do not touch each other at any point, the gears m and is being cut so accurately that this contact, which is needless, may be prevented. By referring to Figs. 4 and 5 the peculiar formation of the teeth 5 and the relation thereto to the teeth of the saw, as well as the general relation of the disks to the saw, will be clearly apparent. The diameter of that portion of the disks 1 and s on which the teeth 5 are cut is somewhat greater than the diameter of the portion below the teeth, whereby provision is made for the intermeshing of these teeth (which extend only through said enlarged portion of the disks) without bringing the lower edges of the latter together, whereby a passage between the disks is left for the saw 7, the teeth of which extend beyond the intersecting line of the teeth on the disks.

It will be seen that the lower ends of the teeth 5 of the setting disks are inwardly curved, as at 8, Fig. 5, which curve represents substantially the degree of the set it is desired to give to the teeth and represents sub stantially the outward curve of the tooth. It will be noticed that the bottom of the out between two of the teeth 5 extends inward be yond the plane of the periphery of these disks, between which the saw 7 is guided, thereby forming pockets to receive the teeth of the saw as they are forced to the right and left by the passage of the saw between the disks.

From the foregoing description it will be clear that the operative portion of the teeth 5 is the lower end thereof only and that part thereof above said lower ends, except such as is needed for strength, may be done away with, provided the driving of the disk is not dependent upon their mutual engagement. The teeth 5 are made as shown herein to per mit of grinding off their operative edges as they wear away. This wear, however, is very small, as'the surfaces of the teeth are relatively broad, and. the disks may be hardened.

As to the manner of feeding the saw to the setting-disks, the particular feeding devices herein shown are not essential to the successful operation of the machine, for any feeding before described, and the teeth of the saws should be yieldingly pressed up into engagement with the ends of the teeth 5 on the setting-disks. It is obvious that once engaged between the disks the saw will feed itself that is to say, it will be drawn through between the rotating disks by the engagement between the teeth of the saw and the lower ends of the teeth 5, the saw-teeth being bent over between the teeth 5 as it moves on between the disks.

Preferably the machine is built with the disks r and s non-adjustable. It might be desirable, however, to effect slight adjustments of the disks one toward the other, whereby the degree of set of the saw-teeth may be changed more or less. One method whereby this adjustment could be effected would be, for example, to divide the bracket p, as shown at 10, Fig. 3, making one-half of itsay the right-hand end-adjustable toward the other half, the two parts being secured together by a screw 10, then making the bearing 7' of this shaft adjustable in the bed-plate in a slot therein and securing the bearing, as by an arm 12, to the movable half of the bracket-arm p, whereby the entire shaft h and its bearings could be moved more or less toward or away from the shaft 0. Of course the extreme limit of this adjustment would be very small.

The formation of a saw-tooth on a curved line, as shown in Fig. 7, instead of on an oblique straight line (which is the present practice) is of very great importance, as it presents a rounded cutting-surface to the material which it is operating on and will out much faster for the same reason that a roundnosed chisel will cut faster than a flat chisel. This undoubtedly is due to the fact that the curved cutting-tooth breaks away the chip which forms in front of it immediately,

whereas a fiat chip will hang together longer, and thus constitute more of a shoulder against which the teeth of the saw must be pushed. Whatever the explanation may be, it is a fact capable of demonstration in practice that a saw, especially a hack-saw, such as is used on metals having teeth set on a curve such as is formed by means of the machine described herein will cut more than one-third faster than a saw set in the usual manner.

It will sometimes happen that the blanks are narrower at one end than the other, and when these blanks are toothed and put through the setting-machine the teeth on the narrower end thereof would not extend up into the intermeshing teeth of the second disks if the saw-guide were immovable; but with the latter pressed yieldingly upward a saw passing therethrough will have the teeth thereon forced upward against the ends of the teeth of the setting-disk in such manner that the narrower end of the blade will have IIS its teeth set in the same manner as though the blade Were of full Width.

From the foregoing it is to be understood that the essential features of the invention reside in the combinations Which include the setting members 1 s and the elements 5 5, S 8, 7, and t. This construction provides for properly and rigidly holding the saw Within the plane Where the thrust occurs for setting the teeth. Also the extended length of the teeth 5 permits of regrinding, and the yielding abutment and guide if serve to support and thrust the saw against the setting-bevels.

Having thus described my invention, What I claim, and desire to secure by Letters Patent of the United States, is-

1. In a saw-setting machine, a pair of rotatable setting members provided With plain saw-holding disk portions, and toothed portions, the toothed portions of said members having an intermeshing relation and provided at their inner ends with setting-bevels deflected toward and leading to said plain or untoothed portions, and a 'uide and abutment located at one side 0' the untoothed portions of said members and arranged to support the saw against the setting-bevels.

2. In a saw-setting machine, a pair of retatable setting members provided With plain saw-holding portions, and With toothed portions, the toothed portions of said members having an intermeshing relation and pro vided at their inner ends next to the un toothed portions With setting-bevels, and a yielding guide and abutment located at one side of the untoothed portions of said members, and arranged to support the saw against the setting-bevels.

3. In a saw-setting machine, a pair of rotatable disks provided with plain saw-holding portions or one diameter and intermeshing toothed portions of a larger diameter than said plain portions, and intermeshing teeth extending entirely across the portions of greater diameter and provided at their inner ends With setting-bevels, and a yielding guide and abutment arranged to yieldingly hold the saw through the space between the untoothed portions of the disks and against the setting-bevels.

CHARLES NAPIER.

Witnesses:

K. I. OLEMoNs, WM. H. OHAPIN 

